AS39513 datasheet(26/108 Pages) AMSCO

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[v1-10] 2018-Apr-25

AS39513 − Detailed Description

Logging Timer

The AS39513 device has an integrated RC oscillator that is

calibrated to fRTC. This oscillator drives the logging timer. The

logging timer resolution is 1 second. The maximum period is

tLOGINT =9.1 hours (32768 seconds). The logging interval is

programmed by setting the LOGINT System parameter.

The measurement real time is derived from 4 parameters – the

Start time (STIME), the Delay time (LOGDEL), the log interval

(LOGINT ), and the # of the measurement (MEASCNT ). This value

has to be calculated in the reader by the equation:

Real time = STIME+LOGDEL+LOGINT*MEASCNT

Delay Time

The AS39513 supports delayed start of the logging procedure.

The Delay time has a resolution of 8 minutes - 32 seconds (512

seconds) and a maximum value of 582 hours (12 bits). The delay

time value is set with the LOGDEL System parameter, while the

Delay time counter starts counting when the device enter in

WAIT mode.

The delay time can also be disabled and an external push button

at the DIN pin can be used for starting the logging procedure.

When in the WAIT state, a pull-up current is supplied to DIN. A

falling edge on DIN manually causes a transition from WAIT

mode to ACTIVE mode.

AS39513 bảng dữ liệu(PDF) 26 Page - ams AG